Animating Ext.Sheet

Animating Ext.Sheet

I need the following functionality:
There is a map with custom markers on it. I handle the tap event and need to show the panel in the top part of the map with information about the tapped item.
Initially I used the docked component, but when I hide/how it, ther map jumps as well, because component does not cover the map, it moves it down.
That's correct behavior for docked items, but I need a different one. So I utilized and Ext.Sheet for this. It works like a charm (I only needed to add it to the component where I want it to appear otherwise it appeared in the very top of the page), but I need more now. I want it to slide up/down with animation. Here'w what I use: